Joomla up to 5.4.7/6.1.2 CORS cross-domain policy

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.1$5k-$25k0.00

Summaryinfo

A vulnerability was found in Joomla up to 5.4.7/6.1.2. It has been classified as problematic. This vulnerability affects unknown code of the component CORS. The manipulation leads to cross-domain policy. This vulnerability is listed as CVE-2026-71573. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Joomla up to 5.4.7/6.1.2. It has been rated as problematic. This issue affects an unknown code block of the component CORS. The manipulation with an unknown input leads to a cross-domain policy vulnerability. Using CWE to declare the problem leads to CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. Impacted is confidentiality. The summary by CVE is:

Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests.

The identification of this vulnerability is CVE-2026-71573 since 08/07/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/19/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-2926). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Open Source Joomla

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.1
VulDB Meta Temp Score: 3.1

VulDB Base Score: 3.1
VulDB Temp Score: 3.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross-domain policy
CWE: CWE-942 / CWE-346 / CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

08/07/2026 CVE reserved
08/18/2026 +11 days Advisory disclosed
08/18/2026 +0 days VulDB entry created
08/19/2026 +1 days VulDB entry last update

Sourcesinfo

Product: joomla.org

Status: Confirmed

CVE: CVE-2026-71573 (🔒)
GCVE (CVE): GCVE-0-2026-71573
GCVE (VulDB): GCVE-100-391823
CERT Bund: WID-SEC-2026-2926 - Joomla: Mehrere Schwachstellen

Entryinfo

Created: 08/18/2026 18:34
Updated: 08/19/2026 17:58
Changes: 08/18/2026 18:34 (63), 08/19/2026 17:58 (7)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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